Cut off the ends of the leeks keeping a little of the light green part, remove outer layers and wash them. Slice them in half lengthwise, and cut them in ½-inch pieces.
Place the olive oil in a cooking pot over medium heat. Add the spring onions and the mushrooms and sauté for 3 minutes. Add the leeks and continue sautéing. Add the rice and sauté for one more minute.
Stir in the vegetable stock and add the dill, lemon zest, and salt.
Reduce the heat, cover the pot with the lid, and let it cook for 20 minutes.
Add the lemon juice, slightly stir, cover, and let it cook for 5 more minutes.
Remove from the heat. The rice should be cooked and there should be a small amount of liquid left which will be absorbed while it cools. Cover the pot with a clean towel and put the lid on top of it. Let it stand for 10 minutes.
Garnish with chopped dill and freshly-ground pepper and serve.
NOTES
RICE: You can use 1 ½ cups of long-grain rice if you don't want to use wild rice.